I have a lot of respect for the Mormons. They are sincere and have a reputation for being honest. They don't smoke or drink. I don't even think they drink coffee.
Jehovah's Witnesses believe that the Bible was not meant to have new writings added to it. At least not until the thousand year rule of Christ.
"Every saying of God is refined. He is a shield to those taking refuge in him. Add nothing to his words, that he may not reprove you, and that you may not have to be proved a liar." Proverbs 30:5,6
“I am bearing witness to everyone that hears the words of the prophecy of this scroll: If anyone makes an addition to these things, God will add to him the plagues that are written in this scroll; and if anyone takes anything away from the words of the scroll of this prophecy, God will take his portion away from the trees of life and out of the holy city, things which are written about in this scroll." Revelation 22:18,19
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LDS writers express profound misgivings about the Bible’s reliability because of alleged deletions and translation errors. Mormon apostle James E. Talmage, in his book A Study of the Articles of Faith, urges: “Let the Bible then be read reverently and with prayerful care, the reader ever seeking the light of the Spirit that he may discern between truth and the errors of men.” Orson Pratt, an early Mormon apostle, went further: “Who knows that even one verse of the whole Bible has escaped pollution?”
On this issue, though, the Mormons do not appear to be aware of all the facts. True, the Bible text has been copied and translated repeatedly over the years. Yet, the evidence of its essential purity is overwhelming. Thousands of early Hebrew and Greek manuscripts have been scrutinized alongside more recent copies of the Bible. For example, the Dead Sea Scroll of Isaiah, dated from the second century B.C.E., was compared with a manuscript dated over a thousand years later. Had serious corruptions crept in? On the contrary, one scholar’s analysis stated that the few discrepancies found “consisted chiefly of obvious slips of the pen and variations in spelling.”
After a lifetime of intense study, former British Museum director Sir Frederic Kenyon testified: “The Christian can take the whole Bible in his hand and say without fear or hesitation that he holds in it the true Word of God, handed down without essential loss from generation to generation throughout the centuries.” Thus, the psalmist’s words are still true today: “The words of the Lord are pure words: as silver tried in a furnace of earth, purified seven times.” (Psalm 12:6, King James Version) Do we really need more?
“Thou fool,” reproaches The Book of Mormon at 2 Nephi 29:6, “that shall say: A Bible, we have got a Bible, and we need no more Bible.” Many Mormons, however, have pondered the apostle Paul’s stern words in the Bible at Galatians 1:8 (KJ): “Though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed.”
LDS scholars explain that the new scripture is not beyond what is declared in the Bible but is only a clarification and complement thereof. “There is no tension between the two,” writes Rex E. Lee, president of Brigham Young University. “Both the Bible and the Book of Mormon teach the same plan of salvation.” Is there agreement between these books? Consider the Mormon plan of salvation.
“Though we do not remember it,” explains Lee, “we existed as spirits before this life.” According to this LDS belief of eternal progression, by strict obedience a man may become a god—a creator like God. “God himself was once as we are now, and is an exalted Man, and sits enthroned in yonder heavens,” stated Joseph Smith. “You have got to learn how to be Gods yourselves, . . . the same as all Gods have done before you.” Mormon prophet Lorenzo Snow said: “As man now is, God once was; as God now is, man may become.”
Is such a future presented in the pages of the Bible? The only offer of godhood ever recorded there was the empty promise by Satan the Devil in the garden of Eden. (Genesis 3:5) The Bible shows that God created Adam and Eve to live on earth and instructed them to produce a perfect human family that would live here in happiness eternally. (Genesis 1:28; 3:22; Psalm 37:29; Isaiah 65:21-25) Adam’s willful disobedience brought sin and death into the world.—Romans 5:12.
The Book of Mormon says that had the former spirits Adam and Eve remained sinless, they would have been childless and joyless, alone in Paradise. So its version of the sin of the first married couple involved sexual intercourse and childbearing. “Adam fell that men might be; and men are, that they might have joy.” (2 Nephi 2:22, 23, 25) Spirits in heaven are thus said to await a chance to live on a sinful earth—a necessary step toward perfection and godhood. Says the LDS magazine Ensign: “We look upon what Adam and Eve did with great appreciation rather than with disdain.”
“This doctrine [that man existed in the spirit creation],” says Joseph Fielding Smith, great-nephew of Joseph Smith, “in the Bible is only discerned through a mist or fog . . . because many plain and precious things have been taken out of the Bible.” Further he states: “This belief is based upon a revelation given to the Church, May 6, 1833.” Therefore, while accepting the Bible’s authority, in case of disagreement LDS doctrine necessarily assigns greater weight to the words of their prophets.
Jehovah's Witnesses on the other hand, accept the Bible first and foremost even above their own Bible study publications.
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Leslie H has my vote... After all she was born into a Mormon family.